to follow in great detail the changes, visible or invisible, to which matter in its various forms is subject. Then it was shown that the coal placed in a stove unites with a portion of the air entering through the drafts, and becomes an invisible gas, but that, were this gas collected as it issues from the chimney, it would be found to contain a weight of the elements of the coal just equal to the weight of the coal used. In a similar manner it was shown that the raindrops are formed from the water found in the air, as an invisible vapor. The gold dissolved in the acid, may be wholly recovered so that every particle is accounted for. Numerous investigations on this subject were made by the most skillful experimenters of the age, all of which showed that it is absolutely impossible to create or destroy the smallest particle of matter; that the most man can do is to change the form in which matter exists.

After this truth had been demonstrated, it was a necessary conclusion that matter is eternal, and th